output
19912026
Showing 2015 · astro-ph.HEShow all

39 papers · 2 filters

astro-ph.HE2015★ 143 cited

Multiwavelength Study of Quiescent States of Mrk 421 with Unprecedented Hard X-Ray Coverage Provided by NuSTAR in 2013

M. Baloković, D. Paneque, G. Madejski +305

We present coordinated multiwavelength observations of the bright, nearby BL Lac object Mrk 421 taken in 2013 January-March, involving GASP-WEBT, Swift, NuSTAR, Fermi-LAT, MAGIC, V…

astro-ph.HE2015★ 25 cited

The 2-10 keV unabsorbed luminosity function of AGN from the XMM-Newton LSS, CDFS and COSMOS surveys

P. Ranalli, E. Koulouridis, I. Georgantopoulos +15

The XMM-LSS, XMM-COSMOS, and XMM-CDFS surveys are complementary in terms of sky coverage and depth. Together, they form a clean sample with the least possible variance in instrumen…

astro-ph.HE2015★ 24 cited

The Spatial Morphology of the Secondary Emission in the Galactic Center Gamma-Ray Excess

Thomas Lacroix, Oscar Macias, Chris Gordon +3

Excess GeV gamma rays from the Galactic Center (GC) have been measured with the Fermi Large Area Telescope (LAT). The presence of the GC excess (GCE) appears to be robust with resp…

astro-ph.HE2015★ 46 cited

Chandra counterparts of CANDELS GOODS-S sources

N. Cappelluti, A. Comastri, A. Fontana +18

Improving the capabilities of detecting faint X-ray sources is fundamental to increase the statistics on faint high-z AGN and star-forming galaxies. We performed a simultaneous Max…

astro-ph.HE2015★ 41 cited

A recent change in the optical and γ-ray polarization of the Crab nebula and pulsar

Paul Moran, Gillian Kyne, Christian Gouiffes +5

We report on observations of the polarization of optical and γ-ray photons from the Crab nebula and pulsar system using the Galway Astronomical Stokes Polarimeter (GASP), the Hubbl…

astro-ph.HE2015★ 9 cited

Flaring of tidally compressed dark-matter clumps

Yacine Ali-Haïmoud, Ely D. Kovetz, Joseph Silk

We explore the physics and observational consequences of tidal compression events (TCEs) of dark-matter clumps (DMCs) by supermassive black holes (SMBHs). Our analytic calculations…

astro-ph.HE2015★ 15 cited

Two evolved supernova remnants with newly identified Fe-rich cores in the Large Magellanic Cloud

Patrick J. Kavanagh, Manami Sasaki, Luke M. Bozzetto +7

Aims. We present a multi-wavelength analysis of the evolved supernova remnants MCSNR J0506-7025 and MCSNR J0527-7104 in the Large Magellanic Cloud. Methods. We used data from XMM-N…

astro-ph.HE2015★ 3 cited

Temperature Measurement during Thermonuclear X-ray Bursts with BeppoSAX

Aru Beri, Biswajit Paul, Mauro Orlandini +1

We have carried out a study of temperature evolution during thermonuclear bursts in LMXBs using broad band data from two instruments onboard BeppoSAX, the MECS and the PDS. However…

astro-ph.HE2015

Evidence for Thermal X-Ray Line Emission from the Synchrotron-Dominated Supernova Remnant RX J1713.7-3946

Satoru Katsuda, Fabio Acero, Nozomu Tominaga +14

We report the first detection of thermal X-ray line emission from the supernova remnant (SNR) RX J1713.7-3946, the prototype of the small class of synchrotron dominated SNRs. A sof…

astro-ph.HE2015★ 268 cited

Multiwavelength Evidence for Quasi-periodic Modulation in the Gamma-ray Blazar PG 1553+113

The Fermi LAT collaboration, M. Ackermann, M. Ajello +139

We report for the first time a gamma-ray and multi-wavelength nearly-periodic oscillation in an active galactic nucleus. Using the Fermi Large Area Telescope (LAT) we have discover…

astro-ph.HE2015★ 58 cited

Gamma-ray pulsars: a gold mine

Isabelle A. Grenier, Alice K. Harding

The most energetic neutron stars, powered by their rotation, are capable of producing pulsed radiation from the radio up to gamma rays with nearly TeV energies. These pulsars are p…

astro-ph.HE2015★ 10 cited

Multi-frequency study of the newly confirmed supernova remnant MCSNR J0512-6707 in the Large Magellanic Cloud

P. J. Kavanagh, M. Sasaki, L. M. Bozzetto +5

We present a study of the supernova remnant MCSNR J0512-6707 in the Large Magellanic Cloud. We used new data from XMM-Newton to characterise the X-ray emission and data from the Au…

astro-ph.HE2015★ 45 cited

Discovery of a red supergiant counterpart to RX~J004722.4-252051, a ULX in NGC 253

M. Heida, M. A. P. Torres, P. G. Jonker +6

We present two epochs of near-infrared spectroscopy of the candidate red supergiant counterpart to RX~J004722.4-252051, a ULX in NGC 253. We measure radial velocities of the object…

astro-ph.HE2015★ 126 cited

The XMM-Newton view of the central degrees of the Milky Way

G. Ponti, M. R. Morris, R. Terrier +10

The deepest XMM-Newton mosaic map of the central 1.5 deg of the Galaxy is presented, including a total of about 1.5 Ms of EPIC-pn cleaned exposures in the central 15" and about 200…

astro-ph.HE2015★ 22 cited

Local and global aspects of the linear MRI in accretion disks

Henrik N. Latter, Sebastien Fromang, Julien Faure

We revisit the linear MRI in a cylindrical model of an accretion disk and uncover a number of attractive results overlooked in previous treatments. In particular, we elucidate the…

astro-ph.HE2015★ 23 cited

XMM-Newton Large Program on SN1006 - I: Methods and Initial Results of Spatially-Resolved Spectroscopy

Jiang-Tao Li, Anne Decourchelle, Marco Miceli +2

Based on our newly developed methods and the XMM-Newton large program of SN1006, we extract and analyze the spectra from 3596 tessellated regions of this SNR each with 0.3-8 keV co…

astro-ph.HE2015★ 35 cited

The Giant Radio Array for Neutrino Detection

Olivier Martineau-Huynh, Kumiko Kotera, Didier Charrier +18

High-energy neutrino astronomy will probe the working of the most violent phenomena in the Universe. The Giant Radio Array for Neutrino Detection (GRAND) project consists of an arr…

astro-ph.HE2015★ 24 cited

Optical and X-ray early follow-up of ANTARES neutrino alerts

S. Adrian-Martinez, M. Ageron, A. Albert +137

High-energy neutrinos could be produced in the interaction of charged cosmic rays with matter or radiation surrounding astrophysical sources. Even with the recent detection of extr…

astro-ph.HE2015★ 55 cited

Hard X-ray Morphological and Spectral Studies of The Galactic Center Molecular Cloud Sgr B2: Constraining Past Sgr A* Flaring Activity

Shuo Zhang, Charles J. Hailey, Kaya Mori +15

Galactic Center (GC) molecular cloud Sgr B2 is the best manifestation of an X-ray reflection nebula (XRN) reprocessing a past giant outburst from the supermassive black hole Sgr A*…

astro-ph.HE2015★ 1 cited

Constraining GRB progenitors environment with Swift XRT

Dounia Saez, Diego Götz

The characteristics of the Gamma-Ray Bursts (GRBs) environment may reflect the differences in GRB progenitors: long GRBs are expected to be found in high-density star-forming regio…

astro-ph.HE2015★ 96 cited

Fifteen years of XMM-Newton and Chandra monitoring of Sgr A*: Evidence for a recent increase in the bright flaring rate

G. Ponti, B. De Marco, M. R. Morris +13

We present a study of the X-ray flaring activity of Sgr A* during all the 150 XMM-Newton and Chandra observations pointed at the Milky Way center over the last 15 years. This inclu…

astro-ph.HE2015★ 13 cited

Monochromatic neutrino lines from sneutrino dark matter

Chiara Arina, Suchita Kulkarni, Joseph Silk

We investigate the possibility of observing monochromatic neutrino lines originating from annihilation of dark matter. We analyse several astrophysical sources with overdensities o…

astro-ph.HE2015★ 33 cited

Search for Early Gamma-ray Production in Supernovae Located in a Dense Circumstellar Medium with the Fermi LAT

M. Ackermann, I. Arcavi, L. Baldini +108

Supernovae (SNe) exploding in a dense circumstellar medium (CSM) are hypothesized to accelerate cosmic rays in collisionless shocks and emit GeV gamma rays and TeV neutrinos on a t…

astro-ph.HE2015★ 31 cited

Quasi-periodic oscillations in accreting magnetic white dwarfs II. The asset of numerical modelling for interpreting observations

C. Busschaert, E. Falize, C. Michaut +2

Magnetic cataclysmic variables are close binary systems containing a strongly magnetized white dwarf that accretes matter coming from an M-dwarf companion. High-energy radiation co…